I love these earrings - I bought a pair.
They were slightly tricky (hence the 4 stars) to get in but they havent missed a beat yet. I think they'd be a lot easier to put on if they were like the flat back earrings that twist on from the back rather than the front.
I think it would look really nice in a helix piercing but I'm yet to try.
I highly recommend purchasing one or two! Just be aware that it will take more than a second to get them on. Otherwise 10/10 perfect.